Lesson 26: finding roots graphically, J ly c±d ©x o 4, X (zd 2 – HP 48G User Manual
Page 79
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Lesson 26: Finding Roots Graphically
In Lesson 17, yon found all of the roots of a polynomial using the
SOLVE application.
This lesson shows you how to
use the
special
analytic tools
in
the
PICTURE environment to find
the roots
of
a
function
v i s u a l l y
as well as search for other information about a
function.
Example:
Plot the function,
— 5A'^ — 2A'“ + A' — 4, and
find its real roots.
S t e p 1 :
Begin the PLOT application and reset, the plot display
options.
FÍES
® @ F (T) flCT
(B OK
PLDT®
TVPE:
INDEP:
X
H-VIEW:-6.5
6.5
_ftUTDSClHLE V-VIEH:-3. 1 3.2
ENTER FUNCTinH(s:i TD PLOT______
S t e p 2 :
Enter the function.
C
l
J ly C±D ©X O 4
® 0 -5 ©"^ (zD 3 ® 0 2
©X (ZD 2
© © ©X
Q
4
(ENTER 1
plot
;
TYPE: Function Rad
INDEP:
X
H-VIEW:-6.5
6.5
_flUTDiCRLE V-VIEW:-3.1 3.2
ENTER FUNCTIDH(S) TO PLOT_______
■naiiiPrriliUi—iiiJHiNiTiHgiaailBi
S t e p
S :
Erase
the
"blackboard” (the PICTURE display) and
draw
the function.
I
HiiiisiBBnl
Bin
Plotting Equations and Analyzing Graphs 6-13